Had a look at your website and it does not give the approximate number of BBs in your 1kg bag. In trying to work out the number I have weighed a 3k bottle of ASG Blaster 0.25g BB which is 750g, so I would assume that your 1kg bag contains about 4k BB (25% extra). Would that be a fair guess? Your free P&P is a definate plus point. Do you have any plans to expand the range to heavier weight BBs?